If you're gonna be 8-8 you might as well be 1-15
I don't quite agree with this.
1-15 will get you the number 1 draft pick but I'm not sure that necessarily turns a 1-15 team to play off contenders. Not in the NFC West anyway.
An 8-8 says you are a team that is almost a play off team. 2-3 extra wins and you are a wild card. To get 8-8 in the NFC West with 4 games against the Seahawks and the Cardinals you'd need to be a decent team.
The 49ers are a long way from being an 8-8 team at the moment though. If they happen to go 8-8, then they'll have reasonable draft picks to address any potential weaknesses (e.g. WR). They also got a shit load of cap space. That could get even bigger if Kap, Brooks and Bethea are cut. If you are an 8-8 team, rather than 1-15, you've probably got more chance of convincing free agents they have a chance of winning if they join you.
Plus you are unlikely to have the churn of another coach, and another playbook, if you go 8-8. Not many coaches will survive a 1-15 record and take a team into a 2nd season.