yes, absolutely there should be nostr browsers. most of them will be built on top of the electron chrome engine of course, and this makes embedding regular web pages easier, and apps that use other GUI systems (gtk, qt) will likely system web views in a similar way.

getting around ISPs is not gonna be an easy one because they are thoroughly embedded with the government regulations. they opened the monopolies up in the 80s, breaking up the telephone/telegraph/post government companies and then opening those all up to competition, we are still quite a long way from having any realistic chance of people managing the bulk of the last mile of internet access at a community level, and really, the backbones are always going to be managed by specialists, same as specialists in road building build the roads.

it will just be a matter of market forces and activist users using their power to vote with their feet to concentrate demand high enough to yield such breakthroughs.

small, mostly autonomous regions like here in Madeira are places where this has a greater chance of catching on. that's why it is one of the places that is rising in this way, Boracay in the phillipines also has some potential for going this road with the very active LN activity there.