Is it underused asset utilization? Collaborative consumption? Allocative efficiency? Idle capacity reduction? Fractional ownership? Timesharing?
Or is it just sharing?
When multiple people use the same asset, it's just sharing. And it's just smart. Hotels aren't known as "p2p room sharing networks" (for good reason)- but it makes no sense to buy a whole new house when you go on vacation for a few days, or to bring your existing house with you.
Access is the new own. Assets will (should) be more like that famous coffee commercial, "good til the last drop".