Due to RWT I highly doubt PixelTail Games will ever actually add in this kind of option ( despite being very nice to have )
Originally with PixelTail Games being very firm on NO MTX in Tower unite it is not likely.
Furthermore if the game ever does skyrocket in popularity, like it heavily deserves to.
Then it will become popular to RWT Units/items, which out of everyone, the PixelTail Games team are the ones who deserves the extra money
The only thing i could see happening is some sort of funding to help the team continue with the game.
However I feel, since much more people know of the game after being released ( me included )
along with having concrete content & game-play, with vast expand-ability and ideas that could be implemented.
The team would be best resorting to crowd funding again via indigogo/kickstarter/gofundme etc to help them out, at the expensive of some more backer rewards being awarded
( salty I never knew about the project earlier to claim backer features )