How about we start a poll and ask everyone's opinion on if they prefer bike quad mix, or bikes and quads on different days, or don't care either way? There are plenty of members and maybe we would be surprised by the results??
Such a poll would be extremely useful if you had representative sampling, which means means someone would have to conduct the poll in the pits at race events. You would need to ask a few more questions to break things down. its called market research of which very little is done in this sport. Internet speculation is useless.
I would poll a mixed event and a bike only event. Maybe even a practice. (Also a quad only event if one is available) I'd even poll people at non-race riding parks like Bear Creek to figure out what it takes or if its possible to get them racing.
With the question of mixed, different days, and don't care ask it separately pertaining to races and to practice. In addition to this question I'd want to know the following:
Do you ride bike or quad?
What class do you race?
Is race day more of a focused mission, to get your races in, and go home, or is it more of a social event to relax, and hang around the track, and socialize?
Does being sanctioned, points tracking matter to you?
Why did you choose this track today? (Closest too me, no other races scheduled, track prep, no quads, etc.)
Would you be prefer to be at a practice today if one was available?
What are the two greatest obstacles that prevent your from more racing in order of importance?
What are the two greatest obstacles that prevent your from more practices in order of importance?
How many non-racing people typically come to race specifically because you are racing that day?
Aside from the admission fee, how much would you estimate this group typically spends on concessions? Other track vendor merchandise and services?
We've all got lots of theories, mostly based on our own small circle of friends. You could hand out a printed survey to every racer at signup with these or any other questions you can think of. You give a ticket with each survey turned in, and draw for a cash prize at intermission to motivate people to fill them out and turn them in.
Since 1998 I have directly brought now more than 200 racers onto the track, who had not ever raced before. Most were adults. I won't even guess how many indirectly from startup trike groups in other states. Most have been on 3 wheelers, but a number of quads and bikes as well. My own market research has been narrowly focused on 3 wheeling trail riders, (often regarded as "quads") but the main point is that a little actual scientific representative sampling, and research tuned to your areas of concern, an looked at and openly pondered without bias, and you would find that a lot of barriers are easily removed, or reduced. Your not going to find that data on a forum that is narrowly focused in Bike MX.
Its not about deciding who gets their way by majority rule. Its about trying to accommodate the most people with solutions that are at least acceptable to the minority. Sometimes you can fully satisfy most of both with simple solutions. Some people will never be satisfied, and at some point you need to find out if efforts to appease them are too costly for the return. No matter what you do, it will send some people elsewhere. Best you can do is make decisions that minimize the damage. If you try to be everything to everybody, you'll end up being nothing to anybody.