you're making assumptions. i've been using Illustrator and Photoshop since version 1.0 (well, version 88 in illustrator's case).
my living depends on adobe and having seen what they've done over the last ten years to my favourite tools allows me to bash them with my eyes wide open, thank you very much.
adobe's dominance in the market has more to do with them being allowed to acquire macromedia and scuttling their competition.
corel had their chance on the mac, but failed to release a version for so long that by the time they got around to it, nobody cared any more.
the competiton between freehand and illustrator was so productive that many graphic artists used both, myself included.
i've never used indesign since i've also been using quark xpress since 1.0, when the alternative was aldus pagemaker, widely regarded as second grade in the professional world. framemaker was one of the best tools for technical publishing and for long documents that xpress didn't handle well at the time.
the first version of indesign was not suitable for a production environment, since it had severe output problems (to postscript devices of all things! that's kind of a big deal when you're done with a project and need to deliver film).
live picture was a great tool and both a competitor and a complementary tool to photoshop. bought by adobe.
pagemaker is dead. freehand is dead. framemaker is dead.
all died at adobe's hands.