And I'll ask the same question. Explain why you think some great producer is going to hop on to do a D&D movie using no established popular work? What is the motivation? To be laughed at by critics? Or just take the money and hope you can some up with something interesting?
Something I forgot to address, on the topic of motivation.
My best suggestion for making a D&D movie would be to hire Vin Diesel and the Rock (and, ideally, the whole team behind the last three "Fast & Furious" movies) to do the job. My main logic there is that they have a track record of making films that are at least entertaining (though I wouldn't necessarily say good), and that are hugely successful.
But, crucially, that also goes some way to dealing with motivation. Vin Diesel is famously a D&D fan (of course), and he's also known to have made films as a labour of love - notably the third "Riddick" film. So it's possible he would be willing to take on the task, and it's likely also that he could get together a team that would do the job, and do it competently.
(That strategy would also suggest
not using Drizzt, for two reasons. Firstly because I'd rather give a hired team of experts free rein to do their stuff, without being bound to stick to the fixed story; and secondly because the tone of the F&F movies is not at all like the tone of the Drizzt stories. Not necessarily better or worse; just
different.)
Having said all that, of course, it's entirely possible D&D fans would respond to a D&D/F&F mash-up with a fairly emphatic "do not want".