There probably won't be because of simple economics. (Even I can understand them, must be simple and obvious.)
Basically even a regional air liner transports a significant amount of people on a regular basis. It is not designed for single transports of single groups, it is designed to serve sustained needs. This means there must be sustained ground transport infrastructure in place at the end points for those groups of people to travel to, gather, embark, disembark, scatter and travel to their destinations.
In other words you need an airport with infrastructure to handle passenger traffic. If you have an airport, you might as well build a runway. It is basically a specialized road for aircraft and you need to build roads anyway.
If you have a runway, conventional take off and landing will be much more economical than a vertical one. That is without the extra mass of the VTOL hardware factored in. Thus the kinds of places it makes sense to use VTOL passenger craft and the kinds of places it makes sense to use air liners, even regional ones, are mutually exclusive.
The amount of traffic is either too low for service by airliners or too high for not building a proper runway that makes VTOL unnecessary waste to make sense.