Reusability is the future. Earlier only government owned space agencies were there. Now private companies have shown their capabilities eg Spacex. Even Rocket lab is planning Neuron reusable rocket. ISRO is planning a test demonstrator called 'Admire'.I know, but bring it don't help much.
Competition is very high, finding forien order is very difficult, since gov of usa/china/Russia/eu don't support it.
Adding mk3 bring isro to achieve 97% of Indian needs.
Best thing about ISRO is low cost for space mission and not launching satellites. Reusable launch vehicle like ones of space x is a huge challenge. ISRO don't have that kind of money, it's like IAF building a force like USAF.
The only thing I hate about ISRO is there timeline and specially that December dates.