In the global chat yesterday Lar said that more slots is actually a good incentive later in the game. Regarless, they are considering other enhancements based on ability level, but want to see how the changes in the next update work out first (the last update was only a partial implementation of their overhaul).
Out of curiosity do we know the level cap in this game? I haven't been able to find mention of it but I haven't looked too hard. Many of the considerations us beta players have given the game are being done considering a top level of around 10.
Gameplay could be very different late game and we'd have no clue, lol.