For a total of $100 million, they could have made 3 cross-platform single-player KoTOR sequels this generation and sold 2-3 million each, easily. That's what Mass Effect sells, so add the star wars license and they could sell 4-5 million copies each across all consoles and PC.
Three games at 2-5 million copies, they'd be looking at at least 300 million to up to a billion in revenue. Skyrim alone made $650 million in revenue at last count, so for 3 KoTOR games we're just trying to get an estimate of what they could have made. After all costs paid, 200 million or more in profits.
We don't have sales data from Origin for SW:TOR, but based on retail it's in the neighborhood of 2 million copies sold. Let's assume they sell 4 million copies (very optimistic), and hang on to an average of 1 million subscribers for 1 year (very optimistic).
Say the average price per copy is, $60, averaging out sale prices with collector's editions, so $60*4 million = 240 million. The subscriptions would be 15*12*1 million = 180 million. So this very optimistic projection puts them at $420 million in revenue.
Without even considering the development costs, and on-going support costs for a huge online game, we're looking at gross revenue of $500 million. If we believe this article, that would put net profits at roughly zero. Compared to net profits of 300 million to 1 billion that three KoTOR sequels would have brought in by now.
As you can see, these numbers add up to a financial disaster. What were they thinking? It's clear that at some point they thought they could bring in 10 million subscribers, that's the only reason they would have made SW:ToR instead of three KoTOR sequels. The game won't shut down of course, but unless they match WoW numbers it's a clear financial failure compared to the games they could have made, without even taking into account this rumored record-breaking budget.