If there are more competitors, than they will evaluate their decision further, but at this point it doesn't make sence. All of that "Show" doesn't get to the races on love, it costs money.
It is a financial issue, not with availability of funds, but more with the return on the investment. Continually racing against one competitor would simply be throwing good money onto bad.
Mike has made a big investment to race in Europe, and at this point he is focusing his attention and resources to Europe.