by system failure
The details of the new agreement between Greece and the lenders are rather of little importance. It seems that the four-month period will function mostly as a truce period rather than a period of substantial progress for the two sides to build a bridge between them.
The generalities in the new agreement are very convenient mostly for the Greek side because they will give the flexibility to the Greek government to take some measures during this period against austerity, in order to fight the humanitarian disaster in Greece, as promised.
However, the financial lobbyists, represented by the Troika, insist in the final sadistic fiscal targets, exactly because they know that a devastated economy is impossible to meet them. They will use this four-month period only as an excuse to say later that they treated Greece with enough clemency against the other eurozone members and they will play this card to turn all the eurozone countries against Greece, in order to isolate fully the Greek government.
On the other hand, Tsipras took what he wanted in order to prepare better for a Grexit. The Greek Leftists in power know very well who are dealing with, so they will use this time to prepare for the next battle of this big war. The four-month period is currently a tactical win for the Greeks as it is close to a recent proposal which was not accepted initially by the eurogroup: http://failedevolution.blogspot.gr/2015/02/breaking-four-month-moratorium-proposal.html
Furthermore, the Greek side will exploit this period to build stronger alliance with the Sino-Russian bloc. Tsipras will certainly exploit his visit to Moscow in May (http://failedevolution.blogspot.gr/2015/02/confirmed-putin-calls-tsipras.html), while he will search all the possibilities for a financial aid from BRICS which are building fast an autonomous financial system to decouple their economies from the neoliberal monetary monopoly. In the middle of the negotiations, Tsipras already took the chance to send another message to the Western allies with the help of the Chinese fleet.(http://en.enikos.gr/politics/24368,Tsipras_welcomes_Chinese_fleet_in_Piraeu.html)
This will bring further pressure to the American factor as the nightmare may become true. Losing part of Europe and especially a geopolitically important country like Greece would be absolute disaster for the Western dominance, which is widely disputed already.
If Greece play this card smartly, the Americans will be forced to impose further pressure especially to the Germans to retreat further towards the Greek demands at the end of the four-month period. The relations between the two countries are not in the best shape already. (http://failedevolution.blogspot.gr/2014/07/who-is-considered-ostensible-ally-by-us.html)
However, this will give further extension to the hopes of the European people as the Spanish elections and Podemos win will come even closer. After that, everything is possible. It is the first time that the Western elites are in such a difficult position after many decades of complete dominance. Grexit or not, it seems that they are losing control. What will they do then? Actions as usual in order of magnitude: propaganda - soft assassinations - economic hitmen - hard assassinations - color revolutions - military coups.
That's why it is important the rapid rise of the Leftist powers in other European countries. It would be extremely difficult to apply all these in many European countries simultaneously.