genesis,
One composer's dominance can never take another's exit. That's where we differ. If we go back in history, during 80s, there are around 100 films made every year (and it was only increasing). IR started with just 30-40 films during late 70s till 80s (but gradually increasing). Only during years 1984, 85, 86, 92, 93 he crossed over 50 films. Other years it was only above 40. Considering 100 films made, there are 50% (that's plenty) of space (films) available that time for other composers every year during that time. That's why even Suresh ji was citing Shankar-Ganesh/Deva were making more films. He didn't hold others from composing, just that he didn't deny any offers went his way. Even after 50% of films available to others, we only say 80s is Ilaiyaraaja's period (so, it's not only about the quantity), just because they were more popular than others. IR dominated agreed, but he didn't deny others to dominate and he was not the reason for MSV's exit. MSV's songs were not that popular even though he did more number of movies in 80s (till mid-80s) than in 70s (if you observed closely). So, only MSV sir and people's taste (even if it is good or bad) should be the reason for his exit, not Ilaiyaraaja's dominance. I just quoted 1994/95 only because of your space concern. Because from that period till date, the number of movies by Raja came down drastically. It created more space for others according to you for any composer to come including MSV sir.
