Quarter scale is a in between space for 1/6 and statue collectors.
Most statue collectors prefer the detail and size that the larger scale gives and they do not like joints, so the 1/4 posable figures are not always received well. The 1/6 collectors don't like the space 1/4 takes up and because the releases are few and far between, so it is not that popular for them.
The target collector really is what you described which is a 1/6 collector wanting to slow down. I think statues come out at such a slow release that statue collectors do not feel the impact of widely timed offerings of the Quarter Scale pieces and are more selective of what ends up in their collections due to the space. The 1/6 collectors are more accustomed to rapid fire releases of no less than 20 pieces a year it seems now days from Hot Toys and Sideshow on premium lines.
There will be pieces that both statue collectors and 1/6 collectors will align with such as the EB Joker or the BD Terminator which are iconic and stellar pieces. It's hard to tell if the QS line will continue to get support. I can see hot toys making 2-3 releases a year but not much over that. It's not their bread and butter and no real reason to differentiate other than to show they can do those types of offerings and challenge themselves as a company. I think Bill at Enterbay is consumed with the NBA and the easy cash flow it's delivering so I would not expect much from them in the QS space in the near future. This is of course my opinion, I like the scale but it is challenging to display mixed scale and those with both have to find creative ways to display them together.
I have two sets of Enterbay Batman figures, two HT TDK Batmans, the HT Endoskeleton, EB BD T2, PI WM and now Iron patriot with the HT Fett, Mark 43 and Mark 45 on PO. So it is slowly now getting into double digit pieces for me. Would like to see the Vader and Stormtroopers and if it is A New Hope Vader, I'm in for three pieces right there for sure.