This will probably fail because the best weapon will remain RME, and stuff like oatixur what was made people do delve v1. Plenty of ilevel 119 gear available everywhere with hard to beat skirmish augments. Unless they link this to further upgrading rme it's going to fail badly. I fear that they are going to link it with the last upgrades of relic. New relic are bad as is, so if delve2 turns out to be a mean to +2 relic it's going to be a giant facepalm...
Even if RME stay the best weapon, morimar delve was pretty instrumental at making monk a popular job again.
Alot of people that never really played monk took it up once they had Oatixurs fall into their lap or got the plasm+KI to get them.
Also needing mantra for tojil himself and matamata mechanics just further reinforced that, and thats kind of a neat way to design content.
I see the megaboss weapons more as a gateway drug for people to consider playing jobs that they would otherwise never try to seriously gear out. The same thing happened to a lesser extent when people got upukirex for their casually played DRG and Tsurumarus for SAM.
Some of those people took playing the job to the next level and made an RME for them simply because a good delve boss drop came their way to get them started. I've seen the same sort of pattern emerge with people that got AA/DM weapons.