Yes, it's great fun to talk about the number of digits in the podcast and worry about the number remaining until 999.
- You could switch to another number base for episodes 1000 and beyond. My first thought is Hexadecimal, but anything higher than base 10 might suffice. The existing episodes could be renamed using base 16 and a script could convert those to decimal for display if wanted. It could be done in the background, meaning any reference in previously-recorded episodes would refer to the present decimal system, internally represented in hex. Any search by a user could be converted between number systems in the background for retrieval and delivery of the specified episode number to the person searching for it. The user would then see the decimal equivalent.
- To educate users who know decimal only, it could be done a little more transparently, showing a quick conversion of the decimal into hex (or whatever) and back, if desired.
- You could leave the first 999 episodes as presently numbered and number only episodes after 999 using a new base, referring to the first thousand as THE FIRST CHILIAD.
- You could start "Part 2" or "second sequence" with all following episodes being known as Security Now! S2:001 through S2:999 until it's time for S3:001 (use a P instead of an S if it's a Part 2 rather than a series or sequence).
- The second and subsequent series/sequence(s)/chiliad(s) could be numbered internally using a base which encodes them using three or fewer characters. Security Now! will continue long past the once-imagined passing of Steve Gibson. @Steve and Leo and crew will surely be taking an immortality+anti-aging serum by the time series 4 rolls around...