It's not the timeline that's the problem, but it's the whole 100-year resurrection thing that seems to be a problem. Timeline will always exist, even if you don't make official. But, when you say "Dracula can ONLY come back every 100 years", that's limiting your creativity in regards to continuity.
I DO anticipate both the 1999 game and a game that would take place between LoI and CV3. Moreso the latter, which it would be interesting to see a lack of Dracula. Dracula's always been present, even in games we thought he shouldn't have been(CoD). IGA says that, after LoI, the Belmonts don't meet Dracula until CV3, and he's brought up the idea that there were OTHER vampires that the Belmonts hunted during that time. That interests me a lot.