But when the first reused R values appear, everybody knows that the RNG is flawed anyway. And then fixed RNG code does not help you much to protect transactions that were created with the flawed RNG. Let alone the whole problem of users and their browsers' cache, still executing the broken code.
You can't justify stealing a car because "it was going to be stolen anyway".
Are you sure that bitcoin-related startups will be able to pay salary on a distance of several months?
(My point of view: no)
If you had $30M USD in your pocket and $400,000 a month in revenue resting entirely on your security, no doubt you'd be making that your first priority.