It should be, in and of itself, but Supernet has already swallowed up a lot of Nxt. Ideally, a great crowdfunding project should induce people to buy more Nxt - so in this sense, the market cap is not a hard cap...
To my limited understanding, SuperNET is (huge) extension of NXT, not a third party project. And much or most of what SuperNET and related asset investments spend, doesn't leave NXT ecosystem or comes back to NXT. So it does not much effect the liquidity of NXT, and especially if it succeeds, it will greatly increase NXT liquidity.
And yes, a great crowdfunding project can bring investors to join the crowdfunding platform. A very important question to ask when crowdfunding: will this project be good for the ecosystem as a whole? For example, if the project says the funds will used for salaries, investors should ask: will the NXT received be immediately dumbed into fiats, or will the salaries be payed in NXT? (Is the project about cutting trees and leaving a desert or planting a food forest?!!!)
A question to those more familiar with NXT, are there NXT clients with special crowdfunding features/plug ins (paying dividends etc.)?