Firstly let me say that Ayaan is a gentle sensitive soul who cannot hurt anyone – therefore I doubt he knew Imran was in the car. He is however impulsive and hot headed. I think he set the car on fire as it was "supposedly" the car that broke down due to which all this happened to Nikhat.
So now the story will be that:
Either Imran will be scared and Nikhat will still love him (u know all the tana she is given over her looks – whereas it is portrayed that Imran is good looking – Hassina and Razia have commented on it and also Nuzat and Humeria have teased Nikhat that Imran looks like SRK). This might make Imran and his family realize was a jem of a person Nikhat is!
Or another scenario can be that Imran will be wounded and not be able to have kids – thus bringing Tannu's baby into the picture (however since this is not EK show I don't think this will happen).
Some positive result of all this will:
Hassena bi is a bully who likes to feel important by making other people miserable. She is also greedy and knows Razia will reward her handsomely for her help. What she does not realize is that Razia only cares about her own agenda and no one else. Now because of Razia since her precious son will be hurt I doubt she will be a willing to assist Razia anymore. Also Hassina bi has stupidly been very short sighted and forgotten about the deal she made with Asad and let's not forget that both she and her brother are more scared of Asad than Razia.
Razia will now realize what a loose canyon Ayaan is! Her prediction had been that after seeing his mom humiliated and sister's reputation at risk he will give in – similar to last time when he desperately needed money due to his mom's emotional outburst. What she did not count on was how unpredictable he has become on his own
When Dilsad had asked Asad to promise to never see Ayaan again Asad had said how can you expect me to teach him to walk holding my hand and now when he is ready to walk on his own you want me to abandon him? – implying he can't walk on his own yet and needs Asad by his side so that he does not fall
Also when Humeria was in the hospital Bari bi had also said Ayaan only had one relationship that was dear to him – his brother but you guys (i.e Razia and Shireen) ensured that they got separated so I am hoping now finally Asad will get involved!