Speeking for myself I am still using RH 7.3 on my server and it is updated on a regular basis from the fedora legacy project.
I would not have any worries at all.
RH 9 was quite a change from 7.3 but it might still be a worthy system as long as you keep it updated.
# cat /etc/*release
LSB_VERSION="1.2.0"
Red Hat Linux release 7.3 (Valhalla)
# uname -r
2.4.20-43.7.legacy
# yum update
Gathering package information from servers
Getting headers from: Fedora Project RHL 7.3 Legacy Utilities
Getting headers from: Fedora Project RHL 7.3 OS
Getting headers from: Fedora Project RHL 7.3 Updates
Finding updated packages
Downloading needed headers
No Packages Available for Update
No actions to take
# uptime
5:25pm up 227 days, 17:06, 1 user, load average: 0.69, 0.56, 0.23
Only down time I've had was due to power outages and a few hard drives over the years which were on a software RAID mirrored array.
There is actually a new kernel installed waiting to boot after the next hurricane or other power outage.
IMO -- RedHat still rocks!
