Deleting LinkedIn a good move?

Don't think you should delete the account entirely, esp if you have connections on there you'd like to keep up with. I'd just remove all work/education experience from your account. 

Is there a deactivate option? I'd do that rather than deleting it entirely because like you said, there's always the recruiting aspect. I started a role earlier this year that I thought I'd be at for a long time too but I've had some recruiters come to me with processes from top MM PE and other interesting roles that I probably would've never found out about if it weren't for LinkedIn. In your privacy section you can edit what people see (remove your profile pic, details of where you've worked, etc.) is they're not in your network and effect whether or not you come up in search results. I'd recommend trying that first. 

Keep it

Edit: Didn't see that you said you already secured an offer

Deactivation is the best route

ive not updated my my profile for my last two jobs. its only downside. with the amount of contentious stuff I post on Facebook, I cba with people complaining to my employer. 

One thing that hasn’t been mentioned is removing your LinkedIn from search engines like Google. That’s a setting within LinkedIn as well. I have this on my profile, for example. Less extreme than deactivating (which it seems you’ve elected, which is fine). Just wanted to let you know the full gamut of what’s out there.

I'm pretty privacy conscious myself and recently considered this when deleting social media. I decided against it, instead opting to do the following:

• Setting my email as private and only visible to me
• Set my profile photo visibility to my connections only
• Turning off connection visibility so that nobody can go through my connections
• Turning off my public profile visibility so that I cannot be discovered via search engines
• Changing my last name visibility so that I show as "John S." instead of "John Smith" to users not already connected with me (this is an actual setting, no need to shorten your surname manually)

If the above still isn't adequate for you, then temporarily disabling the account might be your best bet. Personally, the connections/network I've accumulated makes it difficult to simply delete the account. Your primary issue seems to be people finding out where you work (random people, not so much industry colleagues right?) so if you do the above, nobody outside of LinkedIn can view your profile and even if they have an account, they won't see your photo, your email or your full surname. 

For the most part, linkedin is a convenient way to remain connected to your contacts.  Other than that, I do not get much use out of it.  I have thought about shutting it down but not for privacy reasons. I am not that important to be worried about privacy issues, haha.

I mean, if you're in banking or have taken the series exam, there's BrokerCheck...