For most of us, you're either going to Worlds or else you're not even considering going to Worlds. Only a relatively few people are going to be on the fence I think. For most people geography is the main factor involved and I don't realistically expect FFG to move their company to another state in order to be more accessible to more players.
At their own HQ, they'll be in control so no worries about fighting Gencon for how many tables you can get or how long your event can go and so forth. They'll have the power to do whatever they need to do, which is good.
Two games (Star Wars and Thrones) have just had their updated FAQs released. I expect that the other LCGs should be getting their soon as well. For Cthulhu specifically I feel like we really need a firm official ruling about how "from discard" effects should work. If anyone's on the fence about attending the Cthulhu tournament it's probably because of this issue.
One thing that I think puts a lot of people off is that the tournaments overlap quite a bit. I think for many of us, we want to play in more than one tournament in order to justify the expense and effort of traveling - but if your two favorite games are at the same time then you can't do this. OK, yes there are the side events, but it's not quite the same thing. I would like to see more effort made to avoid overlap which would include cracking down on the numerous delays we tend to see at Gencon that put things over schedule and also using more of the day. It may not be 100% solvable but at least get overlap down to a minimum.
Know how many rounds you need. At Gencon we had a change of format which upset a lot of people.