What many people are overlooking is that these LRT lines aren't going to exist in a vacuum. They are all part of a network, each contributing to dispersing passengers. While the LRT will still meet capacity in 2030 (15,000 passengers p/hr demand in 2030, Eglinton carries 19,500), by then we'll have already added new LRT branches or hopefully a Downtown Relief Line cutting N/S across Eglinton. The Eglinton LRT will become more of a feeder line with many people living on Eglinton East or Scarborough choosing it as their main route downtown.
The Eglinton LRT will be an excellent asset for decades to come and its usefulness will only improve as we add more lines and extend the subway.