I don't see it as being all that successful once the nostalgia wears off.
People forget that the original Dallas arguably lasted three or four seasons too long and ended more with a wimper (at best) than a bang.
I think a big part of the success of the original was the novelty of the series. It was a prime time soap opera (which was rare in those days) and the setting was completely unique.
Basically sin and sex in the southwest.
I wonder if they will revive Dynasty now to counter program...