It seems implausible, not because Trek doesn't have basically magical technology, but because it seems likely to me that VR will be possible much earlier. And given the general tech level, new at the start of TNG seems odd.
On the other hand, nothing on Trek is as implausible as mayo on a PB-Banana(?!?).
I'd think holo-addiction would become quite common, with only a few willing to serve in Starfleet, sharing a highly limited number of holodecks with so many people.
I think they do lock though. Didn't someone over-ride Barclay's locks, when he didn't show up for his duty shift?
Which leads to another highly implausible situation - the way holodecks were always free. We never see them go to the holodecks and find they're all in use. And when Barclay goes over, there's never a frustrated crewmember waiting outside.
On the other hand, nothing on Trek is as implausible as mayo on a PB-Banana(?!?).

I'd think holo-addiction would become quite common, with only a few willing to serve in Starfleet, sharing a highly limited number of holodecks with so many people.
I think they do lock though. Didn't someone over-ride Barclay's locks, when he didn't show up for his duty shift?
Which leads to another highly implausible situation - the way holodecks were always free. We never see them go to the holodecks and find they're all in use. And when Barclay goes over, there's never a frustrated crewmember waiting outside.