Congratulations to all people that have held their stakes so far. I wish to be among them, however I've been selling batch after batch quite recently and I'm already happy with the profit.
I'm expecting a huge correction very soon that will be normal of course but there will be smell of blood again. After that sky is the limit

No wonder you are happy with the profit. And congrats to your gain! Although it's probably too early, 1B$ will might be no stop, we just started here. But it's better like this when not all big stakes are not sold at the same time. Unloading during various phases all the way up avoids greater price stress compare to let's say everyone is selling at 10B USD or something like that. NEM has still relatively small daily volume compare to some big fish so we might easily go 10x this year and who knows what can happen in 2-3 years. We are still in the middle of the way, imagine when NEM is one of blockchain standards all over the world. Then your stake might be worth hundreds of millions USD.
Hundreds of millions per stake may be a little bit too much, but one can dream ofcourse

In all seriousness, the whole market is booming now. There is a lot of new money flowing in from people that feel they have missed the previous boats and this is driving the prices to unseen levels.
I don't think we are near the top yet, but the bubble is growing at an alarming rate and can really only burst at one point. NEM even feels like a slow riser at this point if you look at ripple and stellar lumen.
Well, dream or not, considering that Google also started as a small search engine, now it's company with marketcap of 650B USD. Now imagine NEM as global blockchain solution with major market share used by enterprises worldwide in several years. Thinking in terms of NEM stake, it gives you about 0,05% of company which is over 400M USD for Google sized company. Yes, it's extreme but not impossible example. Bottom line is that NEM stake can be realistically worth 100M USD or more one day. In terms of this year, one to several billions NEM marketcap is quite sober possibility. Of course price can go both directions.