I think they are now a competitor for our fans, and as you rightly said our owners and previous regimes, and the sad state of our club, has a role to play in that.
You cant just ring fence it though to current fans though, it is not just black and white. There are also always the floating or occasional fan, and there is the potential to lose these who may want to try a different sport at the Ricoh, or be a glory supporter of a 'winning' Rugby team and they spend their money there rather than at CCFC.
We all know that the main reason we have lost fans in the poor state of the club due to present and past owners, especially the current, and the fact we are starved of success. To discount Wasps as having no potential effect of taking fans away though is naive in the extreme.