Here's my take of it.
I own a few tens websites, and over the years, we did change our IP addresses, hosting companies, nameservers etc. on well established sites, LOTS of times already. There was no negative effect whatsoever on any of these sites. The sites are very different in topics, language, construction, popularity, traffic levels etc. and this worked out 100% OK for all of them. I can therefore confirm from our experience that changing your IP should generally be regarded as safe.
You should be careful though on the common issues discussed here on WPW - like avoid sharing ip with others, avoiding downtimes etc. Also make sure your host doesn't mess your setup. I believe this is the biggest risk you may take - if hosting company reps are stupid, they may mess your website setup and sometimes this can ruin months or years of hard work.
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