So should we expect FFXV and Persona 5 ports very soon ? Seriously though which kind of developers could this potentially affect, only indie right ?
Indies, yup. Games which came to Vita using Monogame include - Axiom Verge; Bastion; Fez & Towerfall Ascension, all which had to use the conversion tool I believe.
Notable missing games include - Mercenary Kings; Stardew Valley & Transistor, so hopefully we'll see some movement with those games since porting should be so easy.