Darwingardener, although I'm not terribly experienced with Viburnums (have been growing them for only a couple of years) I would say that if it were mine I'd be thrilled that it is producing sprouts from the base (and was not dead after its cold dry winter). I would baby it until it thrived and either became the shrub or tree that it wants to be. From what I've read it can grow as either one but only if it's alive : )

In my area of Southern Ontario (same zone as you) V.lentago is fully hardy and prefers to grow in a moist, mostly sunny area. I planted some as an informal hedge a number of years ago, but they didn't do as well as I had hoped. I'm sure it was because they were in far too much shade and in very dry soil. A fellow I know grows them all around his back field for the songbirds. His soil is fairly moist and the plants get lots of sun. Viburnum leaf beetle might attack the plant. Can't give you any advice about that.