I have no idea what is causing the delays in an eASLRB, but I am sure there are well over a couple dozen versions already made by people in the hobby. We have seen various snippets of these here, including one that was online and got a cease and desist order from MMP.
It is not technically challenging to create an html version, and it doesn't require more than a basic text editor for a basic version. Any browser has search capability built in as well so nothing special is needed. What is does require is time and effort.
Once you start adding to what is there, and what you want to be there, then it adds a layer of knowledge and resources required to do that extra, like if you want graphics you will need some kind of graphics programs, etc. To make something official, for sale, requires much more if only for the reasons of copyright protection and because the quality and capability is going to have to be at a level that people will pay for it. A basic, non-graphic version would never sell.
I have spent over 20 years playing with eASLRBs, first using the WinHelp capability and since 2011 an html version. It does what I want it to do, including all my TPP purchases, so it is far more integrated and complete than anything MMP would be able to produce (unless they joined with BFP, LFT, Lone Canuck, etc. to incorporate their products). On the other hand, it does not do a lot of the things others have done with their implementations, nor many of the things people have asked for in a product. One thing to remember is that the amount of product being generated potentially requires a lot of maintenance. Below is my "Version Control" record for my html version. That is a lot of time updating, adding, etc. and without that the eASLRB would become just as stale as the printed version. I love the game, so the time is not a problem, and given it is just for me, any deadlines for getting something completed are dictated by myself. (For instance, I see now that I listed Onslaught to Orsha 2 in my 7.2 version, yet I have not actually completed it as other non-ASL priorities have put it on the back burner for now). Bottom line, if you really desire an updated rulebook, you have the ability to have one and you don't need MMP to produce it. I do believe having one from MMP would help draw in more new players and through that help them as a business.