... Maybe, the UN security council members will agree that "crypto-currencies" are of strategic importance akin to nuclear weapons. In that case, Monero and GavinCoin will be regulated out of existence. The more Agile MPcoin would (hopefully) survive.
The way I look at it:
- As long as the mainstream systems hold up and tolerate cash as legal tender and gold/silver is tolerated as not illegal (which could be indefinitely) crypto-currencies are cool and neat and all that, but mainly a toy.
- If there is a failure in mainstream-land and cryto-currencies are able to step in and fill a non-trivial void then it is almost a sure thing that they will be attacked by interests vested in the mainstream and whatever 'acceptable' instruments step up to the plate (e.g., SDR's or whatever.) These interests generally control today's policies and there is little reason to imagine that changing.
- Ergo, an 'agile' (as you put it) crypto-currency is the only thing worth investing in. Bitcoin still has the potential to be such a thing. Barely. And only because development and hardening could and would happen very quickly if there were an actual need. Once it bloats all bets are off.