I can appreciate your sentiment Nick but in practice I disagree with you. First of all, I don't like the implied characterization of people who don't care about about the title as people who register for the playmat or are players from other formats. When I top 8'd Champs the last two years I did not think it was an accomplishment because it was in tournaments that gave out some title. It was because they were two of the largest vintage events that have ever taken place. If that is not what you intended then let's chalk this up to me misconstruing what you wrote.
Theoretically, I understand the appeal of having a title. However, as others have said, in years past the title was not taken seriously outside of the US. Also, you can give someone a title all you want, but if they win Champs and aren't active in vintage afterwards it is difficult to consider them the champion of the entire format for another 364 days.
On a practical level, there seem to be two possible ways to keep the "purity" of the title, both of which have already been discussed. Either Champs is always in the US or it rotates. It is unfair to vintage populations in other places to do the former. The latter sounds ideal, except when you consider how many people it excludes from attending Champs each year. Not everyone that owns power is wealthy. I purchased mine with tutoring money while in grad school. I can't afford to drop 4 figures to go to Europe to play a card game. I can afford to drive a few hours with friends and share a hotel room. This is surely already the case for European and Japanese players who do not attend Champs in the US.
I think there is universal agreement that the scheduling of these events is terrible. It seems reasonable to have EU Champs in the spring and US Champs in the fall. If US Champs has 400 people and EU has 200, even if the winner of US Champs does not get the title of "World Vintage Champion" I think it's clear who would be considered as such. It's much like hockey. The existence of a Champion in Russia's KHL does not make the players on the Stanley Cup winning team any less excited about winning.
I am not trying to dismiss the importance you place in the title. Everyone can value what they want to. However I think there are many competitive players in this community who feel differently, and more to the point don't think the pros of preserving the title outweigh the cons.