This 1 million percent! There is a real danger someone will come in, shout a lot and say the answer is to now re-write it all or buy in a system, maybe even ou

This 1 million percent! There is a real danger someone will come in, shout a lot and say the answer is to now re-write it all or buy in a system, maybe even outsource it to save money. Don't fall for it - have good tests and incrementally improve what doesn't work - don't listen to dreams of how easy life will be "if only you had a good system" - what you have works, and has scaled to 40k users - past that who knows but you can always copy/mirror everything you have and support 80k users etc.