1) I don't agree that it is "a lot more difficult to buy guns today." There are a few states -- a few -- where it is harder to buy some guns that it was in the past, but since FOPA, and the sunset of the AWB, it actually is easier to buy guns now than it was (more or less) at any time since 1968. (FOPA straightened out some messes made by the GCA.) For the majority of Americans, buying a gun is no more complicated than walking into a gun store, filling out the 4473 and leaving 10 minutes later with their new gun. ANY gun, excepting NFA items. And in the case of rifles and shotguns, they can do that in any state they happen to be standing it (with a very few exceptions), not just their home state.
While buying a gun isn't as simple now as it was up until 1968, and for folks in CA, MA, NJ, IL, and a few other places it may be more difficult if they're looking for a handgun or military-style firearm, I don't agree that it has become much harder to buy a gun than in the past. This is a GOOD time to be shopping!
2) Availability: I don't really know how you can support this assertion. These days there are an unbelievable number of make and models of firearm available to the prospective buyer. Not just a "big three" (four, five ... whatever) of makers but many quality producers. And most of those makers put out a bewildering assortment of models. It may take a buyer a few weeks ... even a few months ... to find EXACTLY this or that gun, if they've got very specific tastes, but anyone who knows enough to be that picky isn't going to be dissuaded by a brief search to find the one they want. Yes, the market and the shelves are pretty bunched up with ARs these days, but if you want a Winchester rifle or a Ruger revolver or a reproduction lever gun in .44-40 -- they're out there and you can have one.
If you're saying a lot of people are going to gun stores, looking around and saying, "Awww, I can't believe they don't have a left-handed Savage 11 in .218 Bee, today! I'm going home, forget this!" well, I don't think that sort of thing happens much. We've got the internet with a handful of nationwide retailers ready to ship you whatever, and gun dealers who will help you scour their networks to find just what you want.
If your complaint is that just what you want is out of production... uh, look, time marches on. I really want an AMC Gremlin. I guess I'm not buying a car because no one seems to make them anymore! Was I really in the car market to begin with? Are there a million folks just like me who will kill the demand curve because they just won't buy a car if they can't have a new Gremlin? I don't think so.