I'd not think such would be very cannon in Ravenloft lore, or even plausible fiscally when you break it down...
Statistically speaking, Barovia is about 30,000 people. Of which, 98% are human, 1% Vistani, 1% Other. The other 1% is around 300 people, incorporating elves, dwarves, and halflings, amongst other assorted races. For sake of this argument though, I'll stick with just those 3... so lets say there are 100 Halflings residing in barovia. Cannon lore, shows most of the Barovian halflings live in hovels around the Village, acting as farmers. (We have ingame representation of this with the little Halfling home near the Ants).
So, lets say 80% of these represent these common-place farmers.. leaving 20 halflings in the rest of Barovia. Ignoring the rest of the communities, for sake of ease, lets say this puts 10 in Vallaki, then, and 10 in the village.
Now... even a hole in the wall tavern is going to require more customer-base then 10 halflings. And that's assuming they are all able to make a living (as jobs for such would be hard, doing things like rat-catching and the like). More would likely integrate in the drain community, or just on the fringes of society, then be allowed to make a place for themselves.
Further, I doubt land owners are going to go out of their way to make such available. Halflings are pretty second rate citizens in Barovian society. They aren't Caliban, but they aren't human, either... And 10 halflings isn't going to keep a business paying the Countess' taxes for long.
...
But, I think adding -something- might be a great idea! If something was going to be made for the halfling community, I'd love to the representation of the common barovian halflings. A small grouping of houses or something out near the village. This is where you'd be more likely to see a tavern for the little-folk, where most the halfling population would be. The single home that's in the server now could certainly be expanded upon, make a small community much like the elves or dwarves currently have in their places. Could add vendors or what not, much like the other communities, and open a place for racial faction growth.