You don't have enough data to know if transaction fees need to increase or bitcoin needs to change its security model to sustain itself.
Technically you are right, let's put on hold this discussion and come back to it when we have more info.
How about you focus on making Nxt all that it is claimed to be instead of rehashing old arguments over and over?
I'm not motivated enough for that. Being a mercenary I did everything I was supposed to do and then quited Nxt core team.