Much ink has been spilled about the 512K routes and various network equipment that has trouble with that limit. You may consider either reducing the number of routes (say not take in the /24s after getting the default route sent to you by the ISP) and not load balance as well as you would like to just do the default route only anyway.
The issue is you may have VPNs, or NATs or other things with static routes that assume that you have the internet routing table. If you have redistributed those static routes into the IGP, when you get rid of your eBGP internet routes you find youself with a routing loop.
Net of this is when you are making a change to your internet routing audit your devices for static routes that are being redistributed and ensure that you do not create a routing loop when you reduce your internet routing table size.
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