"get unwieldy" is a correct and usable phrase in written English.
It is typically used to refer to something that is large and difficult to manage, often because it has grown to a size that is too unwieldy to be easily managed. Example sentence: "The company grew too quickly, and eventually the number of employees and clients became so large that the administration started to get unwieldy."
But the size of the group won't get unwieldy.
As time goes by, things get unwieldy and cumbersome with rules, especially when data changes faster than one can keep up with the rules.
It's also true that you don't "need' to buy everything in the game, but more and more items are going to keep coming, and this currently small pool will get enormous in short order as Rockstar keeps adding stuff, so this gold bar rate for even essentials may get unwieldy regardless.
It certainly seems like a great concept for any start-up to implement, although it could get unwieldy as a company becomes large.
And if you use software, you can add them all (and there are many), and the to-do list won't get unwieldy.
But after a hundred or so pages, a book starts getting unwieldy, especially in those one-handed reading situations (lying walrus-like on my side in bed, strap-hanging on the subway, eating pretzels) and pages start flopping closed.
Make it 40 years and it gets unwieldy.
The genre list is deliberately limited to stop it getting unwieldy.
The reason closings occur: The fund company believes a portfolio is getting unwieldy and won't be able to effectively allocate the torrents of fresh cash sluicing in.
Although he narrows the focus to the plights of an aunt in Auckland, New Zealand, an uncle in London, a half sister in Buffalo, N.Y., a cousin in Moscow, a cousin in Lausanne, Switzerland, and himself, the narrative gets unwieldy.
Since you realise that the best is impossible (especially at higher levels, where subjects get too unwieldy to pin down, and where brainier students abound) you sulk and do nothing at all.
