Lots of standard analogue slot car sets get bought at christmas times a first time purchase, most I understand, by a large margin.
Many get stored away forever (or thrown out or sold on to people already hooked), almost immediately, or after 2 or 3 more cars have been purchased. If this wasnt the case, then almost every home would already have a scalextric set by now!
I think the question is - will digital add more play value to newbie slot kids/adults? Will it mean a bigger percentage of people who try it, decide to keep it and play with it more?
The question of car compatibility did not enter my head when I bought my first set last year; I was planning just to have the great scalextric gt40 models and some track, full stop. If it had occurred to me how many more cars I would be compelled to buy over the following months and how much it would cost, I am pretty sure I would have just walked away in the first place!!! (glad i didn't, but i wouldn't have understood at that time
)
Whether those of us who are home racers and those of us who are club racers want digital is another question entirely....