No I definitely agree there. I dont see him as a potential GOAT or a truly long term dominant player. Even had he done better in 96-98 and ended up around 12 slams max (and even then not likely as some of his later career success is reduced now probably) it would be a case of bleeding a bit at a time rather than ever dominating. He didnt have a huge serve and isnt the best athlete, so he was unlikely to ever be a truly dominant player, just someone who had the ability to be a factor on every surface and for a long time due to his incredible ball striking ability off the ground and hand-eye-coordination.
I am mostly thinking about the mens game more than Agassi himself in the big picture. Mens tennis suffered in a huge way from Agassi decline from 96-98 and become utterly abysmal. Sampras dominating is frankly not a great thing for the game, especialy at the same time Graf was also dominating. As frankly both are kind of boring personalities, with extremely effective but not particularly viewer friendly games, and without a real rivalry in either case apart from Seles and Agassi briefly, tedious and a borderline unbearable situation for the general public, despite their greatness. I am sure in 96 when you had a Kafelnikov-Stich RG final, a Krajicek-Washington Wimbledon final (for the general public and even a lot of the media a huge ewww yuck, the outstanding and very Wimbledon worthy tennis Krajicek played here aside), a one sided Sampras-Chang U.S Open final, a terrible Olympics despite Agassi winning in the end, a lot of people already were tuning out the mens game. And if they didnt already 97 and 98 probably got even worse, with only the emergence of Rafter of probably some interest to the casual tennis viewing public.
During this same time a very weak womens with a badly injured Graf easily winning almost every match and tournament in 96 before her body breaking down pretty much for good, Seles at first promising but eventually mediocre return to the game, Conchita Martinez regularly in the top 3 and folding at the semi final stage of every slam, Pierce being a huge dissapointment after her 94-early 95 rise, Davenport still as hefty as a U-haul for quite awhile, Capriatis at first horrendous return, and 15-16 year old Hingis easily coming in and romping over and dominating over this weak mess in 97. Late 98 what was perhaps one of the golden eras of womens tennis started to open, but prior to that, along with the mens game which badly needed an in form Agassi, what a disaester for tennis fans.