This.
It's a very strange argument for people to make. Look, we all recognize that not only are there competitors to D&D, there are hundreds of competitors to D&D. In fact, if you include historical games and editions, there are tens of thousands of different games.
Not only that, it is relatively easy to create your own games. I do it all the time! I love creating one-shots, and enjoy running them.
Moreover, the existence of multiple on-line communities means that if you want to play on-line, you have even more options than ever. If you go to the various communities on-line, whether it's the widely-available ones (Roll20 etc.), or the more specialized ones that serve a particular game, or even just looking for various discord communities ... you will be able to find "Not D&D."
That said, we do see the common retort that "But it's hard. A lot of people just want to play D&D." Well, that's true. D&D is the most popular alternative. But it's outright bizarre what people are taking from that; instead of understanding that this popularity with the community at large likely indicates that D&D is doing something right, the response, instead, is that D&D must be doing something wrong because it doesn't appeal to that particular person. In other words, the argument is that D&D must fundamentally change, despite being incredibly popular, because it isn't the game for this individual (or individuals). Which ... okay? Most of the suggestions, IMO, would arguably make D&D less appealing as a mainstream product, because it would force it to appeal to a more niche audience.
I truly want people to get what they want, but this always seems like such a bizarre way to look at it; D&D is too popular, therefore it must be changed. Not sure that it survives close examination. IMO, YMMV, etc.