@duylinh i feel you, man, especially when you take a look at what this companies made just 5 years ago - you can see, how much industry degraded in this time... There is no need even for 15 years (as you mentioned), take a look at Studio Pierrot lates works and their quality - its fucking shame what theyve done recently and how poor the quality is... It literally makes my eyes bleed seeing their latest works...
one bright sight - when one door closes another openes - there are few studios who risen at times like this - Trigger, MAPPA and Ufotable, so we should have hopes for some good adaptations