The Earth has 5e24 kg. A 1e4kg rocket going at 7e3m/s is going to cause something around 1e-17m/s change in velocity. And that's considering that Earth receive all the momentum from the rocket's exhaust, what isn't true.
You'll need way too many rockets to cause an even measurable change on Earth's orbit in a million years. Try changing it to a few billions.
