Think at the margin here. You're not saying you should instantly sell because the gelato/ice cream enthusiast ratio has increased slightly. You're saying everyone all at once decided en masse to start eating gelato instead of ice cream. Yes, as an entrepreneur you need to respond to that. That's an enormous and sudden change in not just the long- but even the short-term viability of your endeavor.
Indeed the forced price mechanic improves the short term responsivity of the local economy to such a change, because your scenario suggests a recent total upset in the established order of things. I would rather see you walk away today, from a venture that you realized yesterday was doomed to fail, with an extra $X in your pocket from the shark who bought you out than to see you driven to bankruptcy because you were the last ice cream boy in this mad, gelato crazed new world. Who knows -- maybe you'll start an ice cream stand in a cheaper, more sane part of the world with it.