Is uninstall of Win 10 as simple as...?  

Don't panic! I'm not ready to uninstall Windows 10 just yet but will need to eventually. But, to finish my question; is uninstall of Win 10 as simple as booting into Windows 7, then deleting the Windows 10 partition & re-acquiring that space back to it's original drive? Will something need to be changed in the boot log (?) so my PC wont think there's two OS still? Just asking.

As a Windows 7 user, I didn't care for the original look & feel of Win 8. Win 10 seems to have a more Win 7 look but with apps. If 10 is faster or overall more advanced than Win 7, I can't tell just yet.

With the latest update, some of the Win 10 apps crash but overall the OS appears stable. Other software installed OK; Sony Vegas 12-64 bit, iTunes & Quicktime. VLC Media Player, Apache Open Office on the open source software side install & play fine. I've had a few crashes with Chrome. All in all, Windows 10 seems solid.

Yes, you can boot into 7, delete your TP partition and then extend your 7 partition to use the free unallocated space generated. Then go into msconfig (Run then type msconfig ​and hit <enter>) and delete the boot entry for TP. That should be all.

This is assuming you are dual booting on one drive of course which it sounds like you are :)

If you installed Windows 10 after Windows 7, as a dual boot, it will have installed its own boot manager as the priority.. Deleting the Windows 10 install, will also delete that boot manager.
You will probably need to run the boot repair from the windows 7 installation dvd, in order to rectify it.

If you dual boot on a MBR disk, you can use this procedure:

Dual Boot - Delete a OS - Windows 7 Help Forums

I allocated 50Gb of space for Win 10 on a high capacity storage drive, not C:.

Here's a look at Disk Management from the Windows 10 side. Looks like the bootmgr is on Disk 0 or Windows 7's C: (H: on Windows 10).

So, boot into Windows 7, delete Windows 10 partition and then extend that partition to use the free unallocated space generated. Then run msconfig & delete boot entry fro Windows 10 & that's it?

Yep,
Been there buddy do it the proper way via whs's link,
Otherwise a mess will be made only a 7 media disk will cure
Files might be lost
Cheers.
I might add 10 looks like your default os also Not a good thing to have there :/

Just running bcdboot C:\Windows elevated worked fine for me.

Thanks for the suggestions.

I noticed that a the bottom of whs link is a tutorial (http://www.eightforums.com/tutorials/2372-dual-boot-windows-7-windows-8-delete-windows-8-a.html). The Part One of the tutorial looks like my Disk Management on Windows 7 boot.

Part Two of the tutorial refers to uEFI setup. I don't see where my PC is uEFI. My MB is a Gigabyte P67A-UD3-B3 which uses Award BIOS. So, I don't think Pt 2 if for me.

Part One of the tutorial it doesn't mention changing msconfig to delete Windows TP. Should I?

BTW - I do have my Windows 7 install DVD & also have Oops!Back-up to restore files. If things go wrong, will the boot be repairable using in install DVD?