Psst. You can use Bitcoin for whatever purpose you may see fit. You want to use it as an investment? A payment currency? A way of having real ownership over your money? A way of hiding your wealth from the government? You may even use it to buy those anime waifu pillows or Belle Delphine's bath water and I don't care one bit. Because that's the point! You have complete freedom with Bitcoin, and you don't need to care what people think!
You have said it all, it is a pity some people like to make a mountain out of a small stone, every bitcoiner is entitled to his or her own choices what to use btc for, that does not make btc any less valuable or appear to be dying because many people use it as an investment, btc serves several purpose, anyone can chose which of this purpose they want to use it for.