For VHF and above, SDR# remains the gold standard for SDR software. For HF I believe SDR-Console fits the bill. In my opinion at this juncture I don't believe that any individual or group is going to convince SDR# folks to change their minds. From my understandings at this has unfolded such prior endeavors "did not go too well" for various reasons.
The problem is the manufacturer here is divided. On one side the have an "Unofficial" Facebook Support Group that helps a lot of people that are just starting out, by setting up their sdrplay etc. This unofficial support strategy takes a huge weight off the manufacturers shoulder. But, at the same time this group hinders any hopes of getting the SDR# people to cooperate with SDRPlay by letting them use the software with no limitations.
On the other side you have the manufacturer reaching out to Yousseff @ SDR# to get him to extend the benefit of using their software with SDRPlay but, without distancing themselves from the above mentioned Facebook group.
Both SDRPlay and Airspy are a step up from the Realtek based dongles. And I am positive that this is where most of their business is coming from. People who got their feet wet with RTLSDR and now are looking for something more.
I don't think you can play for both teams. Both SDRPlay and Airspy (SDR#) are business endeavors, and need to be seen as such. After seeing everything develop on Facebook, Twitter and RR Forums. I see that the SDR# group is doing everything to ensure their business is successful. But, what I can't understand is why is SDRPlay not doing the same.
Like you said, SDR# is the gold standard for VHF and up. Some people will say you have HDSDR and SDR-Console. Both great software for what they are. SDR-Console is my #1 choice for HF but It lacks a lot of functionality that can be found when you combine SDR# with the plugins available. Also, SDR#'s develpers are constantly updating and improving their software. The same cannot be said about the other software available.
More than reaching out and waiting which is the stage at which this is now. I think a decision has to be made as to what it is that SDRPlay as a company wants to achieve. A huge and rouge support group that may hinder how successful they are as a company or a friendship with a competitor that could be nothing but beneficial to SDRPlay and its users.