1. High unemployment, preventing consumption
2. High debt load (student, home, credit card) for prime age consumers, preventing consumption
3. Low wages and stagnant wage growth for prime age consumers, preventing consumption
4. Low job stability, leading to cash-in-mattress, preventing consumption
5. Low worker actualization and agency, leading to more time and energy spent at work, preventing consumption
6. Long term poor access to wealth-building financial instruments for most people, reducing accumulated wealth over time, reducing consumption
So as you can see, my opinion is that consumption is weak because people don't have enough money. The WSJ article has a small paragraph about tepid consumer spending, so I guess we agree there.
Aside from these core issues, I'd also speculate that a tremendous quantity of money is trapped in financial instruments. If it's in a financial instrument, it isn't exactly employing people or building goods or creating demand for goods. The same could be said about the billions of dollars held close to the chest by the oligarchy.
There's a huge opportunity here to have a government public works program or some other major initiative to mobilize the underclasses, but it won't be taken.
None of these issues are specific to Q1 2015, and they won't be fixed in Q2, Q3, or Q4.