Turkmenistan Airlines is usually not a carrier of choice between the UK and India if you have plenty of cash - it's likely to be chosen by those who are struggling financially - very much those who have scrimped and saved to buy their tickets. I would imagine that many people who have bought tickets with T5 will not be able to afford to pay for new tickets with another airline until (at the very least) they get a refund on their existing tickets. Given the rather odd ticket sales structure for T5, I imagine it might take a bit longer than usual for refunds to be processed