I don't see the big deal with Apple discontinuing this display, really? I think it bothers people more from a symbolic sense than anything practical. (EG. It means Apple doesn't have a single LCD display to sell you with their logo on it anymore.) Does that really mean the company is getting away from building computers you want to use?
Practically speaking? Everyone I know owns *several* monitors.... often even having spares lying around the house or office. Especially when you're talking about displays smaller than 20" or so, you practically have to give one away to get rid of it. You can find 17" and 19" LCDs on Craigslist all day long that are only $40 or so and still have no buyer after being listed for a month or more.
One of the *selling points* when the Mac Mini was introduced was the fact you'd buy it without any keyboard or mouse bundled, and you could just use it with whatever USB keyboard/mouse combo AND display you already owned.
People on the opposite end of the spectrum, who are super picky about color accuracy and display sharpness, lack of screen glare, etc. have high-end monitor options out there that were never sold by Apple. So they've usually gone that route, denying Apple a sale.
IMO, the biggest argument for this Thunderbolt display was the way you could utilize it as a pseudo "docking station" for your Macbook Pro. That's become much less of a benefit over time, as 3rd. parties have introduced alternative solutions (several Thunderbolt docks out there now). And moving forward, if Apple adopts USB-C like it dabbled with on the new Macbook, this display won't support the connector at all.
What I personally think Apple *should* do is release a 5K monitor with a built-in high performance GPU (one of the new mobile versions of the latest generation of GPUs from nVidia or ATI) and provide a software driver so it works with any existing Mac that it can connect to via Thunderbolt. That could be a HUGE seller, since it would enable existing Macs (even older Macbook Airs!) to have enough graphics power to play the latest 3D games on them. And when you upgrade computers, that capability stays with you for the next Mac you replace it with.
Okay. So this is the direction Apple is taking.
Unless Apple exceeds my expectations with the MacBook Pro refresh, I'm done with this company. There's nothing for me here anymore.