2. Do you think this transaction will stop? I want to send $50 and require a fee of $15

whattttt
Depends on how much time you're willing to wait in the line. If you set 12 sat/vb, which is about $1.5 for average segwit native transaction, you will have it confirmed in about a day.
1. 13.5 GB of our disk space is being wasted by our nodes storing these inscriptions inside transactions. That is 13.5GB used in just 9 months!
That's just true. Stop complaining about the disk space. If you run your own full node, you don't care about other people's transactions. Why would Ordinals be any different? It's the same as stating that a couple of gigabytes are spent every year on Binance's transactions; completely irrelevant to me.