I for one think they should just end it. I think it's disgusting how JBL did that to hornswoggle, even if it is just a show. It's disturbing! Plus, I think at wrestlmania, they should have McMahon vs. Finlay, with Hornswoggle as referee and let that end it all.
This is what pisses me off most about this, people who act like Hornswoggle is a 2 year old kid. Yes he's a midget, but he's like 30 years old. Now obviously he can't really defend himself against someone of JBL's size, but don't say that it's disguisting because it's not.
Anyway this storyline is not shifting to the side of Kennedy coming out as the real son. There was no son. The McMahon's just conspired agaisnt VKM so bringing Kennedy out as the son would make absolutely no sense. Kennedy will get a push soon enough, either by winning the MITB or some other way, so switching the story to make Kennedy the son would be stupid.
So as everyone else said this storyline is dead after Mania. The only way it would technically continue would be if Shane, Steph, and/or Linda came back on TV and they started a feud or something. But, as far as Hornswoggle being Vinc'es son that's over with. My only guess is that the relatives come back and start some sort of feud or Vince makes Finlay's life living hell for a while.