Yeah that what i was saying, Digital only games are intended to be small file size to allow faster downloads. Retail games can be bought from eshop, but most likely have a size problem. (metal gear solid 3d) But is a option, To be honest buying all games digitally is conveinent, but hogs space for other content. I never bought a vita game retail, and i filled a 32GB card cause i buy discount games with Playstation plus. (Most were free) So you can expect retail games to be the main reason why your card is filled faster. While VC games being smallest, DSIware, second, 3DS eshop being third, and Retail largest. That is what i mean, is just observation.
Most likely if you want more space, Buy multiple Sd cards just like harddrives, or storage devices or buy retail games and digitial only. Again, i think nintendo has set a clear standard for what they inteneded.