I don't think that the numbers for RE 1-4 is quite right. Why is that? Because it's so easy to make a copy of PS1 and PS2 game. Even an elementary school can do that as long as they have a computer. In my country, lots of people buy and play RE game at PS1 and PS2 platform, but most of them didn't buy an original copy, because pirated PS1 and PS2 games is being sold so freely. The case is different from RE 5 and 6, which is hard to be pirated (although the PC version can be pirated though).
Also, i remember about a poll in certain forum, asking which RE series is the best. And out of thousands vote, RE 3 came in as the most voted. It shows that most people prefers the old-style that RE 3 and before it gave us. While that number may be too low to represent the majority of RE fans, but at least you can get the general idea, right?
I won't judge who's right and who's wrong. Every person has their own preference on which style they like the most. But for me, i would be happy if RE 7 is finally 'back to nature', and the nature of a zombie is shown better in RE 1-3 than 4-6, where they feature a zombie who can talk, think, run, or even coordinate with each other.