Personally I'd be overjoyed to find a club where the bill of fare was that heavily biased towards the trad repertoire, although my feelings would be tempered with dread that they might not think my own versions were quite traditional enough.

In other words I agree with nearly, but not quite, everyone.

Genuine sighting of the Folk Police - check
The music always has grown and changed and been played on whatever's handy - check
That kind of attitude's bad for the music - check

But is this kind of attitude killing the music, or killing the clubs? I don't see much sign of it either way. On the contrary, I'd say the clubs are either thriving or at least ticking over - and that almost none of them take this attitude or anything like it. Getting back to the OP, I'm sure plenty of places will welcome you with open arms; in fact, I wouldn't be at all surprised if some folk clubs turn you away for being too traditional.