Not really if you think about it. Let's say that you did move to a more modern system sooner. The logical choice would have been to go to the MicroVax which is also dead. The reason why that would have been the logical choice is that it also used the QBus system. The downside is that the software would have to be ported from the PDP 11.
You could have gone with X86 but you would have been stuck deciding if the hardware should be ISA, EISA, or MicroChannel!. Then you would have to decide what RTOS to use or would you just go bare metal? Then you would have to validate every motherboard, chip set, and CPU that you would use not to mention re-writing the software for the X86.
This is part of the problem with going with COTS hardware in industrial settings. Today there are critical systems running on 486 systems and ISA based hardware running under DOS. If you think about it they are in fact no less outdated than PDP-11 based systems from the same time period. The last PDP-11s were introduced in 1990. There does seem to be a cottage industry building new PDP-11 based computers. They are much smaller, faster, and use modern hard drives and ram but still PDP-11s. Some probably use FPGAs for the CPUs, some use X-86 and are emulated in software, and some may even use ASCs. Just as you can still find people that can rebuild an R-2800 radial engine and by parts for old DC-3s it is possible to keep PDPs plugging along.