I agree with Claude's thought that "gaming" the system is perhaps unlikely, but I still think it's the purpose of every well designed governmental system to avoid such things if possible. Some of the possible scenarios would indeed require the people behind the factions to be very devious and make plots behind closed doors, but in our short history as a state we have already been exposed to fairly high levels of similar such "devious" behavior IMO.
If the system can be designed (without going to any ridiculous lengths), so that bad things like that can't happen, I think it's a good thing to do so.
Personally, I think that it's more dangerous that "unpopular" candidates can join a faction and be slipped into the RA (through one of the winners stepping down), than it is dangerous that the RA might be forced to dissolve because of a lack of candidates or members.
Both are "gaming" the system, but in the second case all that results is another election. In the first case you get people in power that were neither expected nor voted for. In my country the governments are always multi-party, usually shaky, and coalitions are formed between various groups. Often they fall unexpectedly and a new election has to be called. So the idea of unexpected elections, or of a particular faction "forcing" an election is just part of the political landscape where I am.
Not saying that means it's right, just that its fairly usual to me.