Need advice!

Hey ladies, I could really use some advice. My husband currently works a ridiculous amount of hours, and has for the past several years. We have 4 kids, and we rarely get to spend quality time together. He works late almost every night, works through most weekends, etc. Over the past few months a company has been asking my husband to come interview, and he finally decided to take the opportunity and has scheduled a formal interview. It's an amazing opportunity for him, he'd (hopefully) be working less, he'll get a pay raise - it's everything we want. The catch is we'd have to pack up and move across the country. And I'm not totally against it, but I'm also having a hard time with it. I have a friend here who has been in my life for more than half my life, she's the most healthy relationship I've had outside my marriage, and she means a lot to me. She basically my ONLY friend (and my only support system, aside from my husband). I know our friendship wouldn't end if I moved away, but it would obviously change drastically.

I know I'm jumping the gun slightly since they haven't made him any kind of official offer yet, but I'm confident in him and that they'll offer him a job, and I don't think this particular company would pursue him so persistently if they weren't very serious about hiring him. So, I'm not asking you all to tell me what to do, but also, wth do I do???