VIDEO: History of Vampires
Sure, Tepes may have tortured and killed as many as 80,000 people by impaling them on spikes, drawing and quartering them, and other messy (and socially unacceptable) ways. Romanian historians don't claim that Tepes was the nicest ruler in Europe at the time, nor someone you'd want to spend a weekend hanging out with.
But they do point out that he was by many accounts a brave patriot who was forced into extreme measures to defend his people from oppression, and that many of the worst rumors that circulated about him were the result of a political smear job and not true.
Furthermore, to be fair, such atrocities were fairly common during Middle Ages. The Catholic Church, for example, eagerly used many of the same barbaric tortures against its enemies, burning people alive, disemboweling them, crushing them under rocks, impaling them, and so on.
So the plans will go forth, and Romanians are eager to profit from vampire tourism, even if it means tainting the reputation of a national hero.