CodeIgniter future with PHP5

[eluser]mrahman[/eluser]
This is a bit off topic. But after around three years of working, are you guys still thinking the same way? I mean, as time goes and more old systems are being rewritten for enhancements, the PHP4 is dyeing really. I understand the people that would respond with "Kohana" or "Work your way PHP5 and let 4 support".. Yes but I thins is a kind of living in past! People who find it hard to switch the framework are far more than people who can't switch their PHP version. PHP6 will show up and what then? You can't have everything and support for many versions would really affect the quality and impede the development. PLUS: old systems may just "stick" and ignore future releases. I'm sure you guys faced challenges with many features just to keep the 4 support.