Can Earth Ponies become Alicorns?

Sure, why not?
By the way, I am still gonna do episode reviews. It’s just gonna take a lot longer than expected. Maybe until season 6 is over? We’ll see.

Vector designer Bast13/Artista
http://bast13.deviantart.com/
Evil BlueRav3 vector by masemj
http://masemj.deviantart.com/
Rift Café Hallway segment art by TheLooneyTurtle
http://thelooneyturtle.deviantart.com/
Journal of the Two Sisters page provided by UnovaBrony
http://unovabrony.deviantart.com/
Additional Lines Provided by Sweetie Bloom
https://www.youtube.com/user/barkbitstaketwo
And Keeneye47/Wolfkeen
https://www.youtube.com/user/keeneye47

Other Vectors/Artwork by:
PokeBrony
http://thepokebrony.deviantart.com/
Thunder Blur
http://thunder-blur.deviantart.com/
atnezau
http://atnezau.deviantart.com/
auveiss
http://auveiss.deviantart.com/
Beavernator
http://beavernator.deviantart.com/
Vector-Brony
http://vector-brony.deviantart.com/
dm29
http://dm29.deviantart.com/
Silentmatten
http://silentmatten.deviantart.com/
Dutchcrafter
http://dutchcrafter.deviantart.com/
LookisTazmily
http://lookistazmily.deviantart.com/
Vectorshy
http://vectorshy.deviantart.com/
SnowedEarth
http://snowedearth.deviantart.com/
M99moron
http://m99moron.deviantart.com/
MarcosMS88
http://marcosms88.deviantart.com/
Soren-the-Owl
http://soren-the-owl.deviantart.com/
matty4z
http://matty4z.deviantart.com/
midnightlunarose
http://midnightlunarose.deviantart.com/
ZuTheSkunk
http://zutheskunk.deviantart.com/
adcoon
http://adcoon.deviantart.com/
Narflarg
http://narflarg.deviantart.com/
iFoxTrax
http://ifoxtrax.deviantart.com/
itv-canterlot
http://itv-canterlot.deviantart.com/
totalcrazyness101
http://totalcrazyness101.deviantart.com/
Botchan-MLP
http://botchan-mlp.deviantart.com/
StarStepPony
http://starsteppony.deviantart.com/
PaulySentry
http://paulysentry.deviantart.com/
masemj
http://masemj.deviantart.com/
90Sigma
http://90sigma.deviantart.com/
midnite99
http://midnite99.deviantart.com/
XboomdiersX
http://xboomdiersx.deviantart.com/
cheesedoodle96
http://cheezedoodle96.deviantart.com/
TheShadowStone
http://theshadowstone.deviantart.com/
Cubonator
http://cubonator.deviantart.com/
ewized
http://ewized.deviantart.com/
Emkay-MLP
http://emkay-mlp.deviantart.com/
TimeImpact
http://timeimpact.deviantart.com/
a01421
http://a01421.deviantart.com/
JordiLa-Forge
http://jordila-forge.deviantart.com/
SilFoe
http://silfoe.deviantart.com/
Plushypie
http://colorslive.com/details/1020392
scienceisanart
http://scienceisanart.deviantart.com/
Vomwerth
http://vomwerth.deviantart.com/
Pilot231
http://pilot231.deviantart.com/
MisterAibo
http://misteraibo.deviantart.com/
ArcheoPony
http://archeopony.deviantart.com/
red-pear
http://red-pear.deviantart.com/
uxyd
http://uxyd.deviantart.com/
BlueThunder66
http://bluethunder66.deviantart.com/
tsurime
http://tsurime.deviantart.com/
AdvanceFiction - Alicorn Twi vector
http://advancefiction.deviantart.com/
Th3Anim8er
http://th3anim8er.deviantart.com/
Fluffytuzki
http://fluffytuzki.deviantart.com/
Equestria-Election
http://equestria-election.deviantart.com/
DayDreamSyndrom
http://daydreamsyndrom.deviantart.com/
R3ap3rG
http://r3ap3rg.deviantart.com/
noxwyll
http://noxwyll.deviantart.com/
Evilbob0
http://evilbob0.deviantart.com/

Music used
Faster Than You Know - BlackGryph0n & Baasik
https://www.youtube.com/channel/UCvzWGXYFDiiJ338KIJPhbhQ
Download link: http://blackgryph0n.bandcamp.com/track/faster-than-you-know-2

Celestia’s Ballad(Dj Gestap trance remix) - Dj Gestap
https://www.youtube.com/channel/UCUYXP93X7n1HS_G_SnJtXVA

Winter Wrap Up (Aftermath Remix) - AftermathMakesMusic
https://www.youtube.com/channel/UC00g7k1M10NdAkc5r_YhSDw

Cupcakes (Knoedels remix) - Knoedelsn
https://www.youtube.com/channel/UCewUEbE-fLukB_de6orEMLQ

The Earth Ponies (Instrumental) - SparrowFae
https://www.youtube.com/channel/UCDvB_Y9oMM9oRQBwA6rOfCQ

Applejack Instrumental Theme - Libby Kautz
https://www.youtube.com/channel/UCwsStU7Ic6a3zpkB6jEqgWA

Raise This Barn Clean Instrumental - iMLPFIM
https://www.youtube.com/user/iMLPFIM

Celestia’s Ballad (Reorchestrated Instrumental) - DragorOrchestrations
https://www.youtube.com/channel/UCeu-TPtoHDan4aJiUGMSw4Q

Apple Orchard (Applejack’s Theme) - EnergyTone
https://www.youtube.com/channel/UCYOpQd3pItEZymBn5XYdhxw
Download link: https://energytone.bandcamp.com/track/apple-orchard

Emerald Eyes (ft. Relative/Pitch) [Remastered] - 4everfreebrony
https://www.youtube.com/channel/UCc1DS7Is5iUZyACnhtKMMiw
Album link: http://4everfreebrony.bandcamp.com/album/equine-dreams-and-stranger-things