Raising the cap will not make things cost more mesos.
Here is what raising the cap will actually do:
Allow players to trade, or sell in fm/ah, for higher than 10b. Currently players are -only- able to trade for higher than 10b by using items as placeholders for mesos. Ex. Primes counting as 2b each or no booms as 4-5b each etc.
Raising the meso cap is purely a convenience, it would not cause prices to go up. If you are concerned with rising prices your battle is with the hacker bots that have caused the inflation.
I'm not really excited about one aspect of legion:
The new V skills will give the hackers in mybckn a big boost in profit for node selling. Nexon why are you unable to connect the """legit""" accounts to their hacking side accounts?